Newzchspy

IN racing or performance driving, the reason for the lighter and two piece rotors is two fold: 1. Better heat dissipation (i.e. less fade) and 2. Less unsprung weight (for both wheels and brakes). Thats why this design, if it works, will be a great addition to any car thats driven in a "spirited" manner. Theres better heat dissipation and the suspension is working that much "less". Now if we could combine Brandon's rotors with an even lighter set of wheels, we'd be great.


Glenn

Tump43

I'm in for a set of slotted/drilled front rotors for the C55. I would imagine, given your post above, that they will be ready in the middle of May. Keep us posted!

AMGDave

Gorgeous! Are these 345mm x 30mm rotors? Any idea when they'll be available, and what final pricing will be (for plain, drilled, slotted, drilled+slotted, etc)?

JDC55

The picture you are looking at is a Brembo rotor with the McLaren hardware. It was designed by Brembo for use on the McLaren F1 road car. Every other bolt on the Brembo rotor is torqued tight to the washer on the rotor. The Spring keeps the "loose" bolts from rattling.

Regardless of the springs both rotors are semi-floating due to the bolt tension. A true full floating rotor would not have the two assemblies bolted together. A full floating rotor, you would be able to move the rotor around with your hands. Much like a motorcycle rotor.



The black buttons hold the two parts together with out any clamping force allowing the rotor to move freely.

"Floating" is pure marketing. All two piece brake rotors have to have float. Steel and aluminum expand at different rates and without "float" engineered into the assembly the rotor or hat would distort. This is not an issue in a one piece rotor due to the fact that it is all the same material.

JDC55

Part 2

You can see this on the photos of the AMG two piece rotor (also a Brembo part)



In this photo you can see the U shaped channel in the black aluminum hat.




In this photo you can see the metal bobbin that rides in the U channel.

This allows the rotor and hat to move independently of each other.

I hope this gives you a better understanding of how float works.

AMGDave

Question about the rear rotors:

The rear rotor has the integrated parking brake mechanism, making it difficult, if not impossible, to make a lightweight center hat. Do you have an alternative in mind for this, or would the parking brake just be deleted if 2-piece rear rotors were produced?

JDC55

You can put a metal insert in the aluminum hat, but do you really need to do that for a parking brake?

mdncn2762

I need rotors...like now.....anything available yet?

Tump43

+1

rubensans

Mercedes parking brakes are independent of the rear rotor, they don't use the inside surface of the rear rotor to break; they have another part inside so the hat of the rear rotor can be 100% aluminium.

I WILL ALSO BE INTERESTED.

By the other hand why not use in this setup the Brembo/McLaren Spring or the Stoptech Belleville Washer so they will be a lot more "floating"?

Best Regards.

c55asleep?

You are saying that the parking brake does not use the inside of the rear rotor??

c3232c

I just had my rear rotors off a week ago and I assure you they use the inside of the rear rotor for the parking brake.

c55asleep?

You are correct.

folex187

Back to the rotors- were these in stock and they sold out or are they just not out yet? I want to know if you can feel a difference with the lost weight.

moosejaw

C55Asleep? What are you the host of jeopardy? LOL

rubensans

Sorry I was wrong.

c55asleep?

The other system of parking brake is threw the caliper itself but i have never seen it on any late model Benz's. Most asian and some domestics.

ToboC32

Any updates? Anxiously awaiting

rubensans

same here

folex187

Can anyone tell me this- how would the weight savings on a rotor compare to weight savings on a wheel? I would think that because the mass is close to the center of rotation that it would have less of an impact than shaving the same weight off of your tires/wheels. Maybe someone in the race scene can offer some info?

Tump43

Me too! Let us know! I need front rotors this week and don't want to buy an OE set or the too expensive set for the CLK 55 030 package.

c32AMG-DTM

You are correct - with rotational weight savings, the further from the wheel hub that the savings occurs, the greater the performance benefit.

FrankW

main difference is that you are taking weight off the "corner" of the car, so you are not throwing extra weight around when going through turns. rotational wise there isn't that much difference.

rubensans

up

johnand

Update?